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Oracle Dataguard中备库中归档日志不同步

[日期:2018-03-08] 来源:Linux社区  作者:xiaocao13140 [字体: ]

环境:RAC+单机 Dataguard
问题:启动备库到ADG模式时,发现后台归档日志并不同步

1、在备库中发现日志的归档日志不同步,内容如下:
MRP0: Background Media Recovery process shutdown (strac)
Managed Standby Recovery Canceled (strac)
Completed: alter database recover managed standby database cancel
Sun Mar 04 16:35:33 2018
Archived Log entry 96 added for thread 2 sequence 130 ID 0x971d6184 dest 1:
Sun Mar 04 16:35:33 2018
RFS[5]: Selected log 11 for thread 2 sequence 131 dbid -1759711868 branch 947273412
Sun Mar 04 16:35:34 2018
Archived Log entry 97 added for thread 2 sequence 131 ID 0x971d6184 dest 1:
RFS[5]: Selected log 11 for thread 2 sequence 132 dbid -1759711868 branch 947273412
Sun Mar 04 16:35:36 2018
Archived Log entry 98 added for thread 2 sequence 132 ID 0x971d6184 dest 1:
RFS[5]: Selected log 11 for thread 2 sequence 133 dbid -1759711868 branch 947273412
Sun Mar 04 16:39:32 2018

2、当在主库节点1中做切换时,备库中日志并不打印相关的日志进程信息,如果在主库节点2中做日志切换时,备库中是有打印日志的信息内容,内容见第一步中信息

3、通过第二步中的现象描述,可以先大概判断为是主库节点1中DG信息可能有问题导致归档日志无法同步过去

4、查询主库中配置归档位置配置的是否有错误信息,查询的结果如下:
SQL> select error from v$archive_dest where target='STANDBY'
2 ;

ERROR

ORA-12154: TNS:could not resolve the connect identifier specified

SQL> select error from v$archive_dest ;

ERROR

ORA-12154: TNS:could not resolve the connect identifier specified

ERROR

ERROR

31 rows selected.
5、通过第4步中的结果,可以判断大概一个方向 ,可能是主库连接到备中监听有问题导致报错,先先TNS配置中查找原因
6、在主库节点1中tnsping 备库配置的服务名看是否报错,操作如下:
[Oracle@rac1:/home/oracle]$tnsping strac

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 04-MAR-2018 16:57:32

Copyright (c) 1997, 2013, Oracle. All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.103)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = strac)))rac =
TNS-12533: TNS:illegal ADDRESS parameters
7、此时在主库节点2中tnsping 备库服务名发现是可以正常解析过来的
[oracle@rac2:/home/oracle]$tnsping strac

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 04-MAR-2018 16:58:17

Copyright (c) 1997, 2013, Oracle. All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.103)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = strac)))
OK (50 msec)

8、检查主库节点1中的TNS文件配置,经发现主库节点1中的TNS有很多的重复项,从而导致备库不能同步归档日志

9、从主库节点2中把TNS文件copy到主库节点1中,此时观察备库中的日志可以正常打印归档日志同步信息,详细内容如下:
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_175f9q9vwo0.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_110f9q9qlco.arc
Media Recovery Waiting for thread 1 sequence 176
Fetching gap sequence in thread 1, gap sequence 176-176
Sun Mar 04 16:00:09 2018
RFS[6]: Opened log for thread 1 sequence 176 dbid -1759711868 branch 947273412
Archived Log entry 78 added for thread 1 sequence 176 rlc 947273412 ID 0x971d6184 dest 2:
Sun Mar 04 16:00:21 2018
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_176f9q9w9h5.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_111f9q9qmng.arc
Media Recovery Waiting for thread 1 sequence 177
Fetching gap sequence in thread 1, gap sequence 177-177
Sun Mar 04 16:00:41 2018
RFS[6]: Opened log for thread 1 sequence 177 dbid -1759711868 branch 947273412
Archived Log entry 79 added for thread 1 sequence 177 rlc 947273412 ID 0x971d6184 dest 2:
Sun Mar 04 16:00:51 2018
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_177f9q9x92z.arc
Media Recovery Waiting for thread 1 sequence 178
Fetching gap sequence in thread 1, gap sequence 178-178
Sun Mar 04 16:00:51 2018
RFS[6]: Opened log for thread 1 sequence 178 dbid -1759711868 branch 947273412
Archived Log entry 80 added for thread 1 sequence 178 rlc 947273412 ID 0x971d6184 dest 2:
Sun Mar 04 16:01:01 2018
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_178f9q9xmc8.arc
Media Recovery Waiting for thread 1 sequence 179
Fetching gap sequence in thread 1, gap sequence 179-179
Sun Mar 04 16:01:01 2018
RFS[6]: Opened log for thread 1 sequence 179 dbid -1759711868 branch 947273412
Archived Log entry 81 added for thread 1 sequence 179 rlc 947273412 ID 0x971d6184 dest 2:
Sun Mar 04 16:01:11 2018
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_179f9q9xxgx.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_112f9q9qmwy.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_113f9q9qmyd.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_114f9q9qncn.arc
Media Recovery Waiting for thread 1 sequence 180
Fetching gap sequence in thread 1, gap sequence 180-180
Sun Mar 04 16:01:11 2018
RFS[6]: Opened log for thread 1 sequence 180 dbid -1759711868 branch 947273412
Archived Log entry 82 added for thread 1 sequence 180 rlc 947273412 ID 0x971d6184 dest 2:
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_1_180f9q9y7sn.arc
Media Recovery Log /archlog/STRAC/archivelog/2018_03_04/o1_mf_2_115f9q9qncr.arc
Media Recovery Waiting for thread 1 sequence 181

总结说明:
1、当发现备库中有日志不同步时,可以先从判断配置DG配置项着手,然后通过v$archive_dest 表可以查看当前的归档状态是否正常,本环境中由于原来的DG环境是正常的,后面出现的问题,可以判断初步搭建环境是Ok的。
2、通过v$archive_dest 查询当前的DG的归档日志信息,如果里面有报错信息,可以提供一个大概的参考范围,方便我们定位问题。

本文永久更新链接地址https://www.linuxidc.com/Linux/2018-03/151254.htm

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